AbstractIn this work, a new g-C
3N
4-based Z-scheme with γ-Fe
2O
3 and β-Ag
2Se both n-type semiconductors, and graphite to favor electron exchange is presented. The composite material was studied by XRD, FTIR, UV-Vis, TEM, XPS, TGA, DSC and TOF-SIMS, and the ability of this photocatalytic system to act as a photo-reductant was assessed using crystal violet (CV
+) dye. Solar light driven photo-reduction of CV
+ in the presence of tri-sodium citrate evidenced a synergistic enhancement of the activity of the composite toward reduction, with ~20 times higher conversion rates per unit of surface area than those of g-C
3N
4. Photo-oxidation experiments under Xe lamp irradiation in the presence of H
2O
2 also showed that the AgFeCN composite featured a higher activity (~8×) than g-C
3N
4. This Z-scheme may deserve further study as a photo-reductant to obtain hydrogen or hydrogenated compounds. Moreover, the use of CV
+ may represent a facile procedure that can aid in the selection of new photocatalysts to be used in hydrogen production.
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